Do you mind giving some examples? I've recently starting selling stuff on ebay but I'm a complete n00b.
I just had a few days ago that I shipped an item internationally and the buyer had to pay Vat/custom tax.
He was all upset at me an wanted me to refund him. After exchanging a few messages - he threatened me that if I dont refund him he will leave me negative feedback. Basically a few minutes later he left me a negative feedback.
What he did was against ebay policy - feedback extortion. I called ebay and a few min later the feedback was removed!
A different time I sold a used item. A few days after the buyer received it he messaged me that the item isnt working. I asked him if it was working when he received it, and he said yes. I told him open a case and have ebay decide if I need to accept a return in this case.
According to the policy of the ebay seller protection - as long as the buyer receives the item working, the seller is not responsible what happens later on... I won the case
I could go on, and on ...
If you plan on having a ebay business - read the ebay bible - all their policys. Get to know them...